Changes in the fossil mammal faunas of Western Transbaikalia during the Pliocene-Pleistocene boundary and the Early-Middle Pleistocene transition

Biostratigraphic studies on small mammals have revealed that the Early-Middle Pleistocene transition can be placed at the Brunhes-Matuyama paleomagnetic boundary (0.78 Ma) which is determined in the middle sequence of the Tologoi key section, between the latest Early Pleistocene fauna of the Tologoi 2.1 and 2.2 and Middle Pleistocene fauna of Tologoi Complex (Tologoi 2.4 and 2.5).